District of Columbia Code Division VIII. General Laws. § 50-405.01. Commercial motor vehicle operation; additional requirements, violation, adjudication.

(1) Fail to slow down and stop before reaching a railroad crossing to check that railroad tracks are clear of an approaching train;

(2) Fail to leave sufficient space to drive through a railroad crossing without stopping;

(3) Fail to obey a traffic control device or the directions of an enforcement official at a railroad crossing;

(4) Fail to negotiate a railroad crossing because of insufficient undercarriage clearance;

(5) Violate an out-of-service order, or

(6) Have an alcohol concentration of 0.04 grams or more per 100 milliliters of blood, per 210 liters of breath, or per 67 milliliters of urine.